Copying time channel entries

[mrme]

Hi,

I am trying to copy selected rows of a time channel ('Time') to another time channel ('NewTime'). 

However, the copied values are different from the original ones.  An example is: -

My script is: -

I suspect I am seeing a resolution limit, but then the original channel displays ok....

(1) How can I get an exact copy of an entry?

(2) Is there a more elegant (or more correct) method than that which I have used?

(3) The original channel ('Time') is from measurements with a sample rate of 10 microseconds.

This time channel was created by splitting a recorded waveform using  WfChnToChn

The microseconds appear to be 'lost' in the channel display - normal?

I am using Diadem 2015   15.0.2f6347 service pack 2, (64 bit)

Thanks in advance for any help

Thomas

[Walter_Rick]

Hi mme,

This is one option:

dim oGroupChn, oChnTOld, oChnTNew, iStart, iStop, iLoop, iIdx

set oGroupChn = Data.Root.ChannelGroups(1).Channels
set oChnTOld  = oGroupChn("TimeOld")
set oChnTNew  = oGroupChn.Add("TimeNew", DataTypeChnDate)

iStart        = 10
iStop         = 100
iIdx          = 0

for iLoop = iStart to iStop
  iIdx = iIdx + 1
  oChnTNew(iIdx) = oChnTOld(iLoop)
next

Greetings

Walter

[Brad_Turpin]

Hi Thomas,

As of DIAdem 2017, losing microseconds and even tenths of microseconds is normal for DIAdem.

For copying multiple datetime rows from one channel to another, you should try the DataBlCopy() function.

Brad Turpin

DIAdem Product Support Engineer

National Instruments

[mrme]

Hi Brad,

Are the microseconds really lost or is it that they are there, but just not visible?

Thanks

Thomas

[Brad_Turpin · Accepted solution]

Hi Thomas,

As of DIAdem 2017, the maximum resolution of a DIAdem datetime value is:

#mm/dd/yyyy hh:nn:ss.ffff

So any resolution smaller than a tenth of a millisecond is lost when the data is sent to the Data Portal.  R&D is looking into ways of addressing this for future versions of DIAdem, but we have no commitments yet.

Brad Turpin

DIAdem Product Support Engineer

National Instruments

[mrme]

Hi Walter,

Thanks! It works for me.  Some resolution as explained by Brad.

Thomas

[mrme]

Hi Brad,

Thanks for the explanation.  It is clearer now.

Thomas